CN110383931B - Method for transmitting and receiving signal based on LTE and NR in wireless communication system and apparatus therefor - Google Patents

Abstract

The present invention relates to a method and apparatus for a New Radio (NR) access technology user equipment to transmit and receive signals in a wireless communication system. The method comprises the following steps: a Physical Downlink Control Channel (PDCCH) order is acknowledged, and if the PDCCH order is acknowledged, a random access procedure is initiated. The random access procedure is characterized in that the random access procedure is configured to transmit a random access preamble through a specific uplink carrier corresponding to the indicator associated with the PDCCH order among the first and second uplink carriers if the first and second uplink carriers are configured.

Description

Method for transmitting and receiving signal based on LTE and NR in wireless communication system and apparatus therefor

Technical Field

The present invention relates to a wireless communication system, and more particularly, to a method of transmitting and receiving a signal based on LTE and NR in a wireless communication system and an apparatus therefor.

Background

Wireless access systems have been widely deployed to provide various types of communication services such as voice or data. In general, a wireless access system is a multiple access system that supports communication for a plurality of users by sharing available system resources (bandwidth, transmission power, etc.) among the plurality of users. For example, multiple-access systems include Code Division Multiple Access (CDMA) systems, frequency Division Multiple Access (FDMA) systems, time Division Multiple Access (TDMA) systems, orthogonal Frequency Division Multiple Access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and the like.

As more and more communication devices require more and more communication capacity, the necessity of enhanced mobile broadband communication compared to conventional radio access technologies is emerging. Also, large-scale MTC (machine type communication) that provides various services at any time and at any place by connecting a plurality of devices and objects is one of major problems to be considered in next-generation communication. Further, discussion is ongoing regarding designing a communication system in consideration of service/UE sensitivity to reliability and delay.

In particular, discussion is being made on introduction of a next generation radio access technology in consideration of enhanced mobile broadband communication, large-scale MTC, URLLC (ultra-reliable low latency communication), and the like. In the present invention, the next generation radio access technology is referred to as NR for clarity.

Disclosure of Invention

Technical task

Based on the above-mentioned discussion, the present invention is directed to a method of transmitting or receiving a signal in a wireless communication system based on LTE and NR and an apparatus therefor.

The technical task that can be obtained from the present invention is not limited by the technical task mentioned above. Also, other technical tasks not mentioned may be clearly understood from the following description by those of ordinary skill in the art to which the present invention pertains.

Technical scheme

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, according to one embodiment, a method of transmitting and receiving a signal transmitted and received by a new radio NR access technology terminal in a wireless communication system, the method comprising: receiving a physical downlink control channel, PDCCH, order on a downlink carrier; and transmitting a random access preamble in response to the PDCCH order. In this case, the random access preamble is transmitted on a first uplink carrier determined based on information on the uplink carrier included in the PDCCH order when a predetermined condition is satisfied, the predetermined condition including a plurality of uplink carriers including the first uplink carrier configured for the downlink carrier, and a cell identification ID of the downlink carrier being the same as a cell ID of the plurality of uplink carriers.

Further, the plurality of uplink carriers includes a second uplink carrier, and the second uplink carrier is a supplemental uplink carrier related to a long term evolution, LTE, band additionally assigned to the NR terminal.

Further, when the first uplink carrier and the second uplink carrier are not configured, the random access preamble is transmitted via the same subcarrier spacing as a random access preamble transmission initiated by a higher layer.

In addition, the method may further include the steps of: at least one of a time resource and a frequency resource is configured to perform uplink transmission. Alternatively, the method further comprises the steps of: parameters for performing uplink transmission are received.

Further, the PDCCH order may be received using downlink DL control information.

To further achieve these and other advantages and in accordance with the purpose of the present invention, according to various embodiments, a new radio NR access technology terminal in a wireless communication system, the terminal comprising: a Radio Frequency (RF) unit; and a processor connected with the RF unit, the processor configured to: control the RF unit to receive a physical Downlink control channel, PDCCH, order on a downlink carrier, control the RF unit to transmit a random Access preamble in response to the PDCCH order. In this case, the random access preamble is transmitted on a first uplink carrier determined based on information on the uplink carrier included in the PDCCH order when a predetermined condition is satisfied, the predetermined condition including a plurality of uplink carriers including the first uplink carrier configured for the downlink carrier, and a cell identification ID of the downlink carrier being the same as a cell ID of the plurality of uplink carriers.

Advantageous effects

According to the embodiments of the present invention, signals can be efficiently transmitted or received based on LTE and NR in a wireless communication system.

The effects obtainable from the present invention may not be limited to the above-described effects. Also, other effects not mentioned may be clearly understood by those of ordinary skill in the art to which the present invention pertains from the following description.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

Fig. 1 is a schematic diagram of an E-UMTS network structure as one example of a wireless communication system.

Fig. 2 is a diagram illustrating the structure of a control plane and a user plane of a radio interface protocol between a user equipment and an E-UTRAN based on a 3GPP radio access network standard.

Fig. 3 is a diagram illustrating physical channels used in a 3GPP LTE system and a general method of transmitting signals using the physical channels;

fig. 4 is a diagram illustrating a structure of a radio frame used in an LTE system;

fig. 5 is a diagram of an example of a resource grid for a downlink slot;

fig. 6 is a diagram illustrating a structure of a downlink radio frame used in an LTE system;

fig. 7 is a diagram illustrating a structure of an uplink subframe used in an LTE system;

fig. 8 is a diagram for explaining a self-contained slot structure in an NR system;

fig. 9 and 10 are diagrams for explaining a connection scheme between a TXRU (transceiver) and an antenna element;

fig. 11 is a diagram for explaining hybrid beamforming;

fig. 12 is a diagram of a base station and a UE suitable for use in one embodiment of the present invention.

Detailed Description

A third generation partnership project long term evolution (3 GPP LTE) (hereinafter, referred to as "LTE") communication system, which is an example of a wireless communication system to which the present invention is applicable, will be briefly described.

Fig. 1 is a diagram illustrating a network structure of an evolved universal mobile telecommunications system (E-UMTS) as an example of a wireless communication system. The E-UMTS system is an evolved version of the traditional UMTS, the basic specifications of which are conducted under the third Generation partnership project (3 GPP). The E-UMTS may be referred to as a Long Term Evolution (LTE) system. Reference may be made to "3rd Generation Partnership Project; release 7 and Release 8 of Technical Specification Group Radio Access Network "understand the details of the Technical specifications of UMTS and E-UMTS.

Referring to FIG. 1, the E-UMTS includes a User Equipment (UE), a base station (eNode B; eNB), and an Access Gateway (AG) which are located at an end of a network (E-UTRAN) and are connected with an external network. A base station may transmit multiple data streams simultaneously for broadcast services, multicast services, and/or unicast services.

One base station has one or more cells. One cell is set to one of bandwidths of 1.44, 3, 5, 10, 15, and 20MHz to provide a downlink or uplink transmission service to a plurality of User Equipments (UEs). Different cells may be set to provide different bandwidths. In addition, one base station controls data transmission and reception of a plurality of UEs. The base station transmits downlink scheduling information of Downlink (DL) data to a corresponding UE to inform the corresponding UE of time and frequency domains of data to be transmitted and information related to coding, data size, and hybrid automatic repeat and request (HARQ). In addition, the base station transmits uplink scheduling information of uplink (DL) data to the corresponding UE to inform the corresponding UE of time and frequency that the corresponding UE can use and information related to coding, data size, and HARQ. An interface for transmitting user traffic or control traffic may be used between base stations. The Core Network (CN) may include an AG and a network node, etc. for user registration of the UE. The AG manages mobility of the UE on a Tracking Area (TA) basis, where one TA includes a plurality of cells.

Although the wireless communication technology developed based on WCDMA has evolved into LTE, the requests and expectations of users and providers are increasing. In addition, since another radio access technology is being continuously developed, new evolution of a radio communication technology will be required to improve competitiveness in the future. In this regard, there is a need to reduce cost per bit, increase available services, use applicable frequency bands, simplify structure and open type interfaces, appropriate power consumption of the UE, and the like.

The following techniques may be used for various wireless access systems such as Code Division Multiple Access (CDMA), frequency Division Multiple Access (FDMA), time Division Multiple Access (TDMA), orthogonal Frequency Division Multiple Access (OFDMA), and single carrier frequency division multiple access (SC-FDMA). CDMA may be implemented by radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA 2000. TDMA may be implemented with a radio technology such as global system for mobile communications (GSM)/General Packet Radio Service (GPRS)/enhanced data rates for GSM evolution (EDGE). OFDMA may be implemented with radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, and evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). The third generation partnership project long term evolution (3 GPP LTE) is part of an evolved UMTS (E-UMTS) using E-UMTS and employs OFDMA in the Downlink (DL) and SC-FDMA in the Uplink (UL). LTE-advanced (LTE-a) is an evolved version of 3GPP LTE.

For clarity of description, although the following embodiments will be described based on 3GPP LTE/LTE-A, it is to be understood that the technical spirit of the present invention is not limited to 3GPP LTE/LTE-A. In addition, specific terms used hereinafter in the embodiments of the present invention are provided to help understanding of the present invention, and various modifications may be made to the specific terms within a scope not departing from the technical spirit of the present invention.

Fig. 2 is a diagram illustrating a structure of a control plane and a user plane of a radio interface protocol between a User Equipment (UE) and an E-UTRAN based on a 3GPP radio access network standard. The control plane means a channel through which control messages are transmitted, wherein the UE and the network manage a call using the control messages. The user plane means a channel for transmitting data (e.g., voice data or internet packet data) generated in the application layer.

The physical layer, which is the first layer, provides an information transfer service to a higher layer using a physical channel. The physical layer is connected to a Medium Access Control (MAC) layer via a transport channel, wherein the MAC layer is located above the physical layer. Data is transferred between the medium access layer and the physical layer via a transport channel. Data is transferred between one physical layer of a transmitting side and another physical layer of a receiving side via a physical channel. The physical channel uses time and frequency as radio resources. In more detail, a physical channel is modulated in an Orthogonal Frequency Division Multiple Access (OFDMA) scheme in the DL, and is modulated in a single carrier frequency division multiple access (SC-FDMA) scheme in the uplink.

The medium access control MAC layer of the second layer provides a service to a Radio Link Control (RLC) layer above the MAC layer via a logical channel. The RLC layer of the second layer supports reliable data transmission. The function of the RLC layer may be implemented as a functional block inside the MAC layer. In order to efficiently transmit data using IP packets such as IPv4 or IPv6 within a radio interface having a narrow bandwidth, a Packet Data Convergence Protocol (PDCP) layer of the second layer performs header compression to reduce the size of unnecessary control information.

A Radio Resource Control (RRC) layer located at the lowermost portion of the third layer is defined only in the control plane. The RRC layer is associated with configuration, reconfiguration, and release of radio bearers ('RBs') to be responsible for controlling logical channels, transport channels, and physical channels. In this case, the RB means a service provided by the second layer for transmitting data between the UE and the network. To this end, the RRC layers of the UE and the network exchange RRC messages with each other. The UE is in the RRC connected mode if the RRC layer of the UE is an RRC connected with the RRC layer of the network. Otherwise, the UE is in RRC idle mode. A layer of a non-access stratum (NAS) located above the RRC layer performs functions such as session management and mobility management.

One cell constituting the base station eNB is set to one of bandwidths of 1.4, 3, 5, 10, 15, and 20MHz and provides a DL or UL transmission service to a plurality of UEs. At this time, different cells may be set to provide different bandwidths.

As DL transport channels for carrying data from the network to the UE, there are provided a Broadcast Channel (BCH) carrying system information, a Paging Channel (PCH) carrying a paging message, and a DL Shared Channel (SCH) carrying user traffic or control messages. Traffic or control messages of a DL multicast or broadcast service may be transmitted via the DL SCH or an additional DL Multicast Channel (MCH). Further, as UL transport channels for carrying data from the UE to the network, a Random Access Channel (RACH) carrying an initial control message and an UL shared channel (UL-SCH) carrying user traffic or control messages are provided. As logical channels located above and mapped to transport channels, a Broadcast Control Channel (BCCH), a Paging Control Channel (PCCH), a Common Control Channel (CCCH), a Multicast Control Channel (MCCH), and a Multicast Traffic Channel (MTCH) are provided.

Fig. 3 is a diagram illustrating physical channels used in a 3GPP LTE system and a general method of transmitting signals using the physical channels.

In step S301, the UE performs an initial cell search such as synchronization with the base station when it newly enters a cell or power is turned on. To this end, the UE synchronizes with the base station by receiving a primary synchronization channel (P-SCH) and a secondary synchronization channel (S-SCH) from the base station, and acquires information such as a cell ID and the like. Thereafter, the UE may acquire broadcast information within the cell by receiving a Physical Broadcast Channel (PBCH) from the base station. In addition, the UE may recognize a DL channel state by receiving a DL reference signal (DL RS) in the initial cell search step.

The UE having completed the initial cell search may acquire more detailed system information by receiving a Physical DL Shared Channel (PDSCH) according to a Physical DL Control Channel (PDCCH) and the information carried in step S302.

Thereafter, the UE may perform a random access procedure (RACH) according to steps S303 to S306 to complete accessing the base station. To this end, the UE may transmit a preamble using a Physical Random Access Channel (PRACH) (S303), and may receive a response message to the preamble using the PDCCH and the PDSCH corresponding to the PDCCH (S304). In case of the contention-based RACH, the UE may perform a contention resolution procedure such as transmitting (S305) an additional physical random access channel and receiving (S306) a physical DL control channel and a physical DL shared channel corresponding to the physical DL control channel.

The UE having performed the above-mentioned steps may receive a Physical DL Control Channel (PDCCH)/Physical DL Shared Channel (PDSCH) (S307) and transmit a Physical UL Shared Channel (PUSCH) and a Physical UL Control Channel (PUCCH) (S308) as a general procedure of transmitting UL/DL signals. The control information transmitted from the UE to the base station will be referred to as UL Control Information (UCI). The UCI includes hybrid automatic repeat request acknowledgement/negative acknowledgement (HARQ ACK/NACK), scheduling Request (SR), channel State Information (CSI), etc. In this specification, the HARQ ACK/NACK will be referred to as HARQ-ACK or ACK/NACK (A/N). The HARQ-ACK includes at least one of positive ACK (abbreviated ACK), negative ACK (NACK), DTX, and NACK/DTX. The CSI includes a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a Rank Indicator (RI), and the like. Although UCI is generally transmitted using PUCCH, UCI may be transmitted using PUSCH if control information and traffic data should be transmitted simultaneously. In addition, the UE may aperiodically transmit UCI using a PUSCH at the request/command of the network.

Fig. 4 is a diagram illustrating a structure of a radio frame used in the LTE system.

Referring to fig. 4, in a cellular OFDM radio packet communication system, UL/DL data packet transmission is performed in units of subframes, wherein one subframe is defined by a given time interval including a plurality of OFDM symbols. The 3GPP LTE standard supports a type 1 radio frame structure applicable to Frequency Division Duplexing (FDD) and a type 2 radio frame structure applicable to Time Division Duplexing (TDD).

Fig. 4 (a) is a diagram illustrating the structure of a type 1 radio frame. The DL radio frame includes 10 subframes, each of which includes two slots in a time domain. The time required to transmit one subframe will be referred to as a Transmission Time Interval (TTI). For example, one subframe may have a length of 1ms, and one slot may have a length of 0.5 ms. One slot includes a plurality of OFDM symbols in a time domain and includes a plurality of Resource Blocks (RBs) in a frequency domain. Since the 3GPP LTE system uses OFDMA in DL, the OFDM symbol represents one symbol interval. The OFDM symbols may be referred to as SC-FDMA symbols or symbol intervals. A Resource Block (RB) as a resource allocation unit may include a plurality of consecutive subcarriers within one slot.

The number of OFDM symbols included in one slot may vary depending on the configuration of a Cyclic Prefix (CP). Examples of the CP include an extended CP and a normal CP. For example, if the OFDM symbol is configured by the normal CP, the number of OFDM symbols included in one slot may be 7. If the OFDM symbol is configured by the extended CP, the number of OFDM symbols included in one slot is smaller than that in the case of the normal CP since the length of one OFDM symbol is increased. For example, in case of the extended CP, the number of OFDM symbols included in one slot may be 6. If the channel state is unstable as is the case when the UE moves at a high speed, the extended CP may be used to reduce inter-symbol interference.

In case of using the normal CP, since one slot includes 7 OFDM symbols, one subframe includes 14 OFDM symbols. At this time, the first three largest OFDM symbols of each subframe may be allocated to a Physical DL Control Channel (PDCCH), and the other OFDM symbols may be allocated to a Physical DL Shared Channel (PDSCH).

Fig. 4 (b) illustrates the structure of a type-2 radio frame. The type-2 radio frame includes two fields, each field having: a special subframe, each of which has 2 slots, and 4 normal subframes, each of which includes a downlink pilot time slot (DwPTS), a Guard Period (GP), and an uplink pilot time slot (UpPTS).

In the special subframe, dwPTS is used for initial cell search, synchronization or channel estimation for the UE. UpPTS is used for channel estimation at eNB and to obtain uplink transmission synchronization with UE. That is, dwPTS is used for downlink transmission and UpPTS is used for uplink transmission. In particular, upPTS is used for PRACH preamble or SRS transmission. In addition, the GP is a period between uplink and downlink, which is intended to cancel uplink interference caused by multipath delay of a downlink signal.

The current 3GPP standard literature defines the configuration of the special subframe as shown in table 1 below. Table 1 shows the values of T _s DwPTS and UpPTS given when = 1/(15000 × 2048), and the other region is configured as GP.

[ Table 1]

In the TDD system, as shown in [ table 2] below, the structure of a type-2 radio subframe, i.e., an uplink/downlink subframe configuration (UL/DL configuration) is given.

[ Table 2]

In [ table 2], D denotes a downlink subframe, U denotes an uplink subframe, and S denotes a special subframe. Table 2 also shows the downlink-to-uplink switching point period in the uplink/downlink subframe configuration of each system.

The illustrated radio frame is only exemplary, and various modifications may be made to the number of subframes included in the radio frame, the number of slots included in the subframe, or the number of symbols included in the slot.

Fig. 5 is a diagram illustrating a resource grid of a downlink slot.

Referring to fig. 5, a downlink includes in a time domain

One OFDM symbol and includes in the frequency domain

And each resource block. Since each resource block comprises

Sub-carriers, whereby the downlink time slot comprises in the frequency domain

And (4) sub-carriers. Although fig. 5 illustrates that the downlink slot includes 7 OFDM symbols and the resource block includes 12 subcarriers, it is to be understood that the downlink slot and the resource block are not limited to the example of fig. 5. For example, the number of OFDM symbols included in the downlink slot may vary according to the length of the CP.

Each element on the resource grid will be referred to as a Resource Element (RE). One resource element is indicated by one OFDM symbol index and one subcarrier index. One RB includes

A resource element. Number of resource blocks included in downlink slot

Dependent on configured downlink transmission bandwidth in a cell。

Fig. 6 illustrates a structure of a downlink radio frame.

Referring to fig. 6, up to 3 (or 4) OFDM symbols located at the head of the first slot of the sub-frame correspond to a control region to which a control channel is assigned. And, the remaining OFDM symbols correspond to a data region to which a PDSCH (physical downlink shared channel) is assigned. For example, DL control channels used in the LTE system may include PCFICH (physical control format indicator channel), PDCCH (physical downlink control channel), PHICH (physical hybrid ARQ indicator channel), and the like. The PCFICH is transmitted on the first OFDM symbol of the subframe and carries information about the number of OFDM symbols in the subframe used for control channel transmission. The PHICH carries a HARQ ACK/NACK (hybrid automatic repeat request acknowledgement/negative acknowledgement) signal in response to UL transmission.

Control information transmitted on the PDCCH is referred to as DCI (downlink control information). The DCI includes resource allocation information and other control information for a user equipment or a user equipment group. For example, the DCI may include UL/DL scheduling information, UL transmission (Tx) power control commands, and the like.

The PDCCH carries transmission format and resource allocation information of DL-SCH (downlink shared channel), transmission format and resource allocation information of UL-SCH (uplink shared channel), paging information related to PCH (paging channel), system information related to DL-SCH, resource allocation information of a higher layer control message such as random access response transmitted on PDSCH, tx power control command set for individual user equipments in the user equipment group, tx power control command, activation indication information of VoIP (voice over IP), etc. Multiple PDCCHs may be transmitted within the control region. The user equipment may monitor multiple PDCCHs. The PDCCH is transmitted on an aggregation of one or more consecutive CCEs (control channel elements). In this case, the CCE is a logical assignment unit used in providing a coding rate for the PDCCH based on a radio channel state. CCEs correspond to multiple REGs (resource element groups). The PDCCH format and the number of PDCCH bits are determined according to the number of CCEs. The base station determines a PDCCH format according to DCI to be transmitted to the user equipment, and attaches CRC (cyclic redundancy check) to the control information. The CRC is masked with an identifier (e.g., RNTI (radio network temporary identifier)) according to an owner or a purpose of use. For example, if a PDCCH is provided for a specific user equipment, the CRC may be masked with an identifier of the corresponding user equipment (e.g., C-RNTI (cell-RNTI)). If the PDCCH is provided for a paging message, the CRC may be masked with a paging identifier (e.g., P-RNTI (paging-RNTI)). If the PDCCH is provided for system information, particularly, SIC (system information block), the CRC may be masked with SI-RNTI (system information-RNTI). In addition, if the PDCCH is provided for a random access response, the CRC may be masked with an RA-RNTI (random access-RNTI).

Fig. 7 is a diagram illustrating a structure of an uplink subframe used in LTE.

Referring to fig. 7, an uplink subframe includes a plurality of slots (e.g., 2 slots). The slot may include different numbers of SC-FDMA symbols according to the CP length. The uplink subframe is divided into a control region and a data region in the frequency domain. The data region includes a PUSCH and is used to transmit a data signal such as audio or the like. The control region includes a PUCCH and is used to transmit Uplink Control Information (UCI). The PUCCH includes RP pairs at both ends of the data region on the frequency axis and hops at slot boundaries.

The PUCCH may be used to transmit control information described below.

SR (scheduling request): information for requesting uplink UL-SCH resources. An OOK (on-off keying) scheme is used to transmit the SR.

-HARQ ACK/NACK: response signal of DL data packet on PDSCH. The information indicates whether the DL data packet was successfully received. ACK/NACK 1 bits are transmitted in response to a single DL codeword. ACK/NACK 2 bits are transmitted in response to the two DL codewords.

-CSI (channel state information): feedback information on the DL channel. The CSI includes CQI (channel quality indicator), and MIMO (multiple input multiple output) related feedback information includes RI (rank indicator), PMI (precoding matrix indicator), PTI (precoding type indicator), and the like. 20 bits per subframe are used.

An amount of control information (UCI) that can be transmitted by the user equipment in the subframe depends on the number of SC-FDMA available for transmission of the control information. SC-FDMA that may be used to transmit control information corresponds to the remaining SC-FDMA symbols except for the SC-FDMA symbols used to transmit the reference signal in the subframe. In case of a subframe in which an SRS (sounding reference signal) is set, the last SC-FDMA symbol of the subframe is also excluded. The reference signal is used for coherent detection of the PUCCH.

Hereinafter, a new radio access technology system is explained. As more and more communication devices require more and more communication capacity, the necessity of enhanced mobile broadband communication is emerging as compared to conventional radio access technologies. Also, there is a need for large-scale MTC (machine type communication) that provides various services at any time and at any place by connecting a plurality of devices and objects. Further, it has been proposed to design a communication system in consideration of the sensitivity of the service/UE to reliability and delay.

In particular, in view of enhanced mobile broadband communication, large-scale MTC, URLLC (ultra-reliable low-delay communication), and the like, a new radio access technology system has been proposed as a new radio access technology. In the present invention, for clarity, the new radio access technology is referred to as a new RAT or NR (new radio).

The NR system to which the present invention can be applied supports various OFDM parameter sets (numerology) described in the following table. In this case, μ and cyclic prefix information according to a carrier bandwidth part may be signaled according to Downlink (DL) and Uplink (UL), respectively. For example, μ and cyclic prefix information for the downlink carrier bandwidth part may be signaled via higher layer signaling DL-BWP-mu and DL-MWP-cp. As a different example, the μ and cyclic prefix information for the uplink carrier bandwidth part may be signaled via higher layer signaling UL-BWP-mu and UL-MWP-cp.

[ Table 3]

μ	Δf＝2 μ ·15[kHz]	Cyclic prefix
			0	15	Is normal
1	30	Is normal
			2	60	Normal, extended
3	120	Is normal
			4	240	Is normal and normal

According to the frame structure of NR, DL and UL transmissions are made up of frames of length 10 ms. A frame may be configured by 10 subframes, each of which has a length of 1ms. In this case, the number of consecutive OFDM symbols in each subframe corresponds to

Each frame may be configured by two fields, each field having the same size. In this case, each of the half frames may be configured by subframes 0 to 4 and subframes 5 to 9, respectively.

For the subcarrier spacing mu, the slots are in ascending order within the subframe as

Are numbered as such and may be in ascending order within a frame as if

Are numbered the same. In this case, as shown in the following table, consecutive OFDM symbols within a slot may be determined according to a cyclic prefix

The number of (2). Starting time slot in subframe

Aligned with the starting OFDM symbol in the time domain in the same subframe. Table 4 below illustrates the number of OFDM symbols according to the normal cyclic prefix of the slot, frame and subframe, and table 5 illustrates the number of OFDM symbols according to the extended cyclic prefix of the slot, frame and subframe.

[ Table 4]

[ Table 5]

In the NR system to which the present invention is applied, a self-contained slot structure can be applied using the above-mentioned slot structure.

Fig. 8 is a diagram illustrating a self-contained slot structure applicable to the present invention.

In fig. 8, a diagonal region (e.g., symbol index = 0) corresponds to a downlink control region, and a black region (e.g., symbol index = 13) corresponds to an uplink control region. The remaining region (e.g., symbol index =1 to 12) may be used to transmit downlink data or uplink data.

According to the above structure, the base station and the UE can sequentially perform DL transmission and UL transmission in a single slot. The base station and the UE may transmit and receive DL data in the slot, and may transmit and receive UL ACK/NACK in response to the DL data in the slot. Therefore, when a data transmission error occurs, the structure shortens the time taken before data retransmission, thereby minimizing the delay of final data forwarding.

In order for the base station and the UE to switch from a transmission mode to a reception mode or from a reception mode to a transmission mode in the self-contained slot structure, a time gap of a predetermined length of time is required. To this end, a part of the OFDM symbol at the timing of switching from DL to UL may be configured as a Guard Period (GP) in a self-contained slot structure.

In the above description, although the self-contained slot structure is explained as including the DL control region and the UL control region, the control region may be selectively included in the self-contained slot structure. In other words, as shown in fig. 8, the self-contained slot structure according to the present invention may include both DL control regions and UL control regions. Alternatively, the self-contained slot structure may include only the DL control region or the UL control region.

For example, the time slots may have various slot formats. In this case, the OFDM symbol of each slot may be divided into DL (D), flexible (X), and UL (U).

Therefore, the UE may assume that DL transmission occurs only in the "D" and "X" symbols in the DL slot. Similarly, the UE may assume that UL transmissions occur only in the "U" and "X" symbols in the UL slot.

Next, analog beamforming is explained.

Since the wavelength becomes short in the field of millimeter waves (mmW), a plurality of antenna elements can be mounted in the same region. In particular, since the wavelength is 1cm in the frequency band of 30Ghz, if the 2D array is installed in a panel of 5 × 5cm and the interval is 0.5 λ (wavelength), a total of 100 antenna elements can be installed. Therefore, in a field of mmW, the coverage or throughput can be increased by enhancing BF (beam forming) gain using a plurality of antenna elements.

In this case, each antenna port may include a transceiver unit (TXRU) to control transmission power and phase according to the antenna element. By doing so, each antenna port may perform independent beamforming according to frequency resources.

However, when TXRU is provided for all 100 antenna elements, utility in terms of cost is reduced. Therefore, consider the following scenario: multiple antenna elements are mapped into one TXRU and the beam direction is controlled by analog phase shifters. Since such an analog beamforming scheme can form only one beam direction in the full frequency band, there arises a problem in that frequency selective beamforming is not available.

As an intermediate type of digital BF and analog BF, a hybrid BF having B TXRUs less than Q antenna elements may be considered. In this case, although there is a difference according to the connection scheme of the B TXRUs and the Q antenna elements, the number of beam directions that can be simultaneously transmitted is limited to B or less.

Fig. 9 and 10 are diagrams for explaining a connection scheme between a TXRU (transceiver) and an antenna element. In this case, the TXRU virtualization model illustrates a relationship between an output signal of the TXRU and an output signal of the antenna element.

Fig. 9 illustrates a TXRU connected to a sub-array. In this case, the antenna element is connected to only one TXRU.

Unlike fig. 9, fig. 10 illustrates that TXRU is connected to all antenna elements. In this case, the antenna element is connected to all TXRUs. In this case, in order to connect the antenna elements to all TRXUs, an additional adder is necessary as shown in fig. 8.

In fig. 9 and 10, W indicates the phase vector multiplied by the analog phase shifter. That is, the direction of analog beamforming is determined by W. In this case, the mapping between CSI-RS antenna ports and TXRUs may be 1 to 1 or 1 to many.

According to the configuration of fig. 9, a disadvantage may be that focusing of beamforming is difficult to perform. On the other hand, there may be an advantage in that the entire antenna can be configured at low cost.

According to the configuration of fig. 10, there may be an advantage in that focusing of beamforming is easily performed. In contrast, since the TRXU is connected to all the antenna elements, there may be an advantage in that the total cost increases.

In the case where a plurality of antennas are used in the NR system to which the present invention is applied, a hybrid beamforming scheme corresponding to a combination of digital beamforming and analog beamforming can be applied. In this case, analog beamforming (or RF (radio frequency) beamforming) corresponds to an operation of performing precoding (or combining) at the RF end. In the hybrid beamforming, each of the baseband side and the RF side performs precoding (or combining). By doing so, advantages may lie in: it is possible to have the same performance as that of digital beamforming while reducing the number of RF links and the number of D/a (digital-analog) or a/D (analog-digital) converters.

For clarity, the hybrid beamforming structure may be represented by N Transceivers (TXRU) and M physical antennas. In this case, digital beamforming of L data layers to be transmitted at the transmitting end may be represented by an N × L (N × L) matrix. Subsequently, the N converted digital signals are converted into analog signals via the TXRU, and analog beamforming represented by an M × N (M × N) matrix is applied to the converted signals.

Fig. 11 is a diagram briefly illustrating a hybrid beamforming structure in terms of TXRU and physical antennas. In fig. 11, the number of digital beams corresponds to L, and the number of analog beams corresponds to N.

In addition, the NR system considers a method of more efficiently supporting beamforming for UEs located at a specific area by designing analog beamforming to change in symbol units with a base station. As shown in fig. 11, the NR system according to the present invention considers introducing a method of a plurality of antenna panels capable of applying independent hybrid beamforming when the antenna panels are defined by N TXRUs and M RF antennas.

As mentioned in the above description, if the base station utilizes a plurality of analog beams, the analog beams advantageous for receiving signals may vary according to the UE. In particular, in the NR system to which the present invention is applied, a beam scanning operation is considered. In particular, the base station transmits signals by applying different analog beams according to symbols within a specific Subframe (SF) so that all UEs have reception opportunities.

In the present invention, when NR UE and NR base station are simultaneously connected to an LTE base station (dual connection) or when NR UE corresponds to UE to which an LTE band is additionally assigned in UL (supplementary UL), a method of transmitting an uplink signal of NR is explained. Although the present invention is described centering on a dual-connected UE or a UE assigned a supplemental UL, the present invention can also be used in different scenarios. For example, the present invention can be applied by regarding the relationship between LTE and NR as the CA relationship in the content of the present invention.

Basically, a dually connected UE or a UE allocated a supplemental UL has a space for using two UL frequency bands for a signal DL. In both cases, since the conventional NR UL band and the LTE UL band exist together, it is ambiguous in that it is difficult to determine whether a UL signal is transmitted on the NR UL band or the LTE UL band. The present invention relates to a method of transmitting an UL signal in the above situation.

In the present invention, although the present invention is described using terms such as LTE downlink, LTE uplink, NR downlink, and NR uplink, these terms may be changed to downlink of frequency band X, uplink of frequency band Y, downlink of frequency band Z, and uplink of frequency band K, respectively, to apply the present invention to different cases except for the dual connection situation. For example, the present invention can also be applied to a case where an LTE band is used as a supplemental UL. Also, the present invention can be applied to all combinations using corresponding band combinations such as NR CA and the like. The frequency bands X, Y, Z and K may correspond to frequency bands including partially identical portions.

<Embodiment mode 1>

When the NR UL signal is transmitted on the LTE band, although the NR UL signal is scheduled in the LTE scheduling request resource, the NR UL signal is not transmitted in the LTE scheduling resource. This is because, since the NR base station cannot know whether or not transmission is performed in the LTE scheduling request resource, the NR base station can cause the NR UE not to transmit the NR UL signal although the NR UL signal is scheduled to the NR UE in the LTE scheduling request resource. In general, if LTE scheduling resources are configured, since it is a PUCCH region, LTE scheduling request resources may be applied only to NR PUCCH signals.

The NR base station transmits configuration information on the LTE scheduling request resource to the NR UE in a manner of transceiving the configuration information on the LTE scheduling request resource between the NR and LTE base stations via the X2 interface. In case of a dual-connection UE, the dual-connection UE may transmit and receive a configuration related to LTE scheduling request resources configured by LTE via an NR LTE upper layer or may transmit the configuration to an NR base station.

The configuration related to LTE scheduling request resources corresponds to UE specific information. However, the configuration can be configured to cell-specifically transmit and receive all information on LTE scheduling request resources in dual connectivity or supplemental UL scenarios.

In the LTE system, although the LTE scheduling request resource configuration is allocated in units of subframes, the same rule can be applied to a case where the LTE scheduling request resource configuration is allocated in units of slots or symbols.

If the LTE scheduling request configuration is allocated in units of slots or symbols, only a portion of the resources intended to transmit the NR UL signal may correspond to the LTE scheduling request resources. In this case, the NR UL signal can be configured to be transmitted by performing rate matching on only the portion. The UE can be informed of information on whether to perform rate matching via higher layer signaling (e.g., RRC signaling) or a control channel.

Although shown as LTE scheduling request resource locations, the same rule may be applied to LTE ACK/NACK resources.

Also, although shown as LTE scheduling request resource locations, the location of the signal to be protected may be configured at once. In particular, although NR UL signals are scheduled at these positions, a rule that NR UL signals are not transmitted at these positions can be defined.

If the UE cannot transmit the NR UL signal due to the LTE signal to be protected, the UE can be informed of information on whether the NR UL signal is retransmitted or discarded at a specific time via a control channel or higher layer signaling (e.g., RRC signaling).

If transmission of the NR UL signal is allowed in the LTE scheduling request resource, power is checked only using a switching scheme, and scheduling request demodulation is performed in the LTE base station without detecting a signal, and it is determined whether to transmit a modulated signal when a scheduling request is actually transmitted, although the NR UL signal and the scheduling request are transmitted together, the scheduling request can be detected. For example, when a scheduling request is transmitted, if a distance difference between the modulated signal and the estimated signal is equal to or less than a predetermined value, it may be determined that the scheduling request has been transmitted.

<Embodiment mode 2>

According to embodiment 2 of the present invention, when an NR UL signal is scheduled on an LTE band, a time (or frequency location) at which a PUSCH or a time (or frequency location) at which an ACK/NACK is scheduled may be indicated by a control channel or may be semi-statically defined via higher layer signaling (e.g., RRC signaling). In this case, the carrier (or band) scheduling the PUSCH or ACK/NACK can be separately indicated (via control channel or RRC signaling).

For example, the base station may indicate one carrier selected from among carriers described below.

LTE carrier

NR Carrier

C. Both (i.e., LTE carrier and NR carrier)

Specifically, the base station may indicate a carrier on which a PUSCH or ACK/NACK is transmitted among an LTE carrier, an NR carrier, or both the LTE carrier and the NR carrier.

The base station may indicate the reliability of both carriers (i.e., C). In this case, the message can be repeatedly transmitted on both carriers. Alternatively, the message can be sent on both carriers by dividing the message. The information on whether the message is repeated or divided may be informed through a control channel or a higher layer (e.g., RRC signaling).

<Embodiment 3>

According to embodiment 3 of the present invention, when scheduling NR UL signals on an LTE band, NR and LTE UL may use different sets of parameters (i.e., sets of parameters with different subcarrier spacings). In this case, the timing (or frequency location) of scheduling the PUSCH or the timing (or frequency location) of scheduling the ACK/NACK may be indicated by a control channel, or may be semi-statically defined by higher layer signaling (e.g., RRC signaling). In this case, the units of TTI (transmission time interval) assumed on the LTE carrier can be indicated separately or together (via control channel or RRC signaling).

And, the transmission timing can be indicated separately or together (via a control channel or RRC signaling). For example, a symbol or a slot in which transmission is performed in a subframe can be indicated.

<Embodiment 4>

As mentioned previously in embodiment 2 and embodiment 3, when an NR UL signal is scheduled on an LTE band (or NR band), a plurality of sets for UL timing, a transmission parameter set, and the like can be configured via RRC configuration, and a control channel may indicate a set among the plurality of sets. In this case, the parameters described below may be included in the set.

A. Transmission parameter set

B. TTI unit for UL transmission timing (when transmission is performed at a particular TTI, this means a single TTI unit if multiple TTIs are defined in a bundled manner, e.g., if three or four symbols occur in sequence, this may correspond to a TTI pattern.)

C. Transmitting carrier wave

D. Reference signal structure (e.g., LTE UL DMRS or NR DMRS). In this case, a value related to a sequence generation parameter of the reference signal may also be included. This is because, when the LTE signal and the reference signal parameter occupy resources together, the reference signal parameter needs to be controlled to maintain orthogonality between DMRSs. Alternatively, the symbol position of the DMRS may also be included. This is because, when an LTE signal and a DMRS occupy resources together, the DMRS needs to be orthogonally transmitted by being placed at the same position between LTE and NR. In order to place the DMRS at the same position between LTE and NR, this may shift the frame boundary of NR. In this case, the shift operation may be indicated via RRC configuration different from the parameters described in embodiment 4, or may be indicated by an indication different from that of embodiment 4.

E. And (4) precoding information. When the position is different between LTE and NR, although LTE and NR occupy the same resource, precoding can be configured so as to separate beams. For this, precoding information of each UE may be exchanged between LTE and NR. Precoding may become precoding information that has less influence on different base stations or precoding information that is large for a signal received by each base station.

<Embodiment 5>

This can indicate MU MIMO (multi-user multiple input and multiple output) to be performed if LTE and NR perform UL transmission simultaneously in the same resource. Or, only when PUSCH/PUCCH simultaneous transmission is not performed, MU-MIMO to be performed by PUCCH and PUSCH can be configured at the position of PUSCH.

For example, DMRSs are transmitted at the same position between LTE and NR, and sequences can be configured to be orthogonal to each other. In this case, in order to place the DMRS at the same position between LTE and NR, the frame boundary of NR can be shifted. In this case, the shift operation may be indicated via an indication of RRC configuration or control channel.

When the location of NR is different from that of the LTE base station due to the application of precoding of each signal, it is possible to configure beams to be separated. For this, precoding information of the UE may be exchanged between LTE and NR.

Alternatively, the UE can be configured to recognize the MU-MIMO situation and inform each base station of the MU-MIMO situation when the UE performs the transmission. Alternatively, the base station may instruct the UE to perform transmission in MU-MIMO case via RRC configuration or control channel.

<Embodiment 6>

In embodiment 6, a piggyback rule is described. In case of dual connectivity UEs, both LTE PUSCH and NR UCI (uplink control information) may be scheduled on the LTE band. In this case, the NR UCI can be configured to use the ACK/NACK resource location only when the piggyback rule of the LTE PYSCH/PUCCH is followed. This is because, since the PUSCH is punctured (processed) only in the ACK/NACK resource, the LTE base station can perform demodulation on the PUSCH although the LTE base station does not know whether or not piggybacking is performed.

If piggybacking is performed on resources other than the ACK/NACK resource location, puncturing can be performed on the PUSCH at the location of the resources. When performing rate matching on the PUSCH, the LTE base station cannot perform LTE PUSCH demodulation if the LTE base station does not know whether piggybacking is performed.

Alternatively, the UE may inform the NR base station of information on whether to perform piggybacking. The NR base station demodulates the NT UL signal according to the piggyback rule. In this case, in order to indicate information on whether to perform piggybacking, an additional sequence orthogonal to DMRS can be transmitted in a UL transmission subframe. And, in order to indicate information on whether piggybacking is performed, the UE may inform the NR base station of the information via signaling between a timing of scheduling and a timing of transmitting an UL signal. The resources for signaling may be indicated to the UE via a DL control channel or RRC signaling.

Alternatively, the UE can be configured to inform the NR base station about whether to perform piggybacking without following the LTE piggybacking rule. And, the NR and LTE base stations may demodulate the UL signal according to a piggyback rule shared between the NR and LTE base stations.

Alternatively, if piggybacking is performed, the NR base station may perform channel estimation for demodulation via DMRS transmitted for LTE. Alternatively, it may transmit the NR DMRS separately at the LTE PUSCH location and puncture the LTE PUSCH at that location.

Alternatively, it may use LTE PUSCH and NR PUCCH in symbol units by performing TDM (time division multiplexing) on LTE PUSCH and NR PUCCH. In this case, the LTE PUSCH is punctured at the time of transmitting the NR PUCCH, and the NR PUCCH may be transmitted in the PUCCH region.

Alternatively, LTE PUSCH is transmitted and NR PUCCH may be dropped. The timing of transmitting the discarded NR PUCCH again may be indicated via a control channel or higher layer signaling (e.g., RRC signaling).

Alternatively, LTE PUSCH and NR PUCCH can be transmitted in MU-MIMO form by applying precoding to LTE PUSCH and NR PUCCH. In this case, the NR PUCCH and the LTE PUSCH can be transmitted in a superimposed form by sharing all or part of resources of the NR PUCCH and the LTE PUSCH. For this, precoding information of the UE may be exchanged between LTE and NR. Alternatively, sequences orthogonal to each other can be configured by changing parameters while the DMRS location is located at the same position between LTE and NR transmissions. To place the DMRS at the same position, the frame boundary of the NR can be shifted. In this case, the shift operation may be indicated via an indication of RRC configuration or control channel.

Unlike embodiment 6, both NR PUSCH and LTE UCI may be scheduled on the LTE band. In this case, although a scheme similar to embodiment 6 can be basically applied, since it is difficult for LTE to know information about whether piggybacking is performed, LTE UCI is transmitted and NR PUSCH can be dropped. The timing of transmitting the dropped NR PUSCH again may be indicated via a control channel or higher layer signaling (e.g., RRC signaling).

<Embodiment 7>

The PDCCH order is described in embodiment 7. Generally, if the synchronization information does not match, the base station transmits a PDCCH order to the UE to instruct the UE to transmit a RACH (random access channel). In this case, in case that the PDCCH order has been received, since the UE follows the contention-free random access procedure, the UE transmits a random access preamble to the base station. The base station transmits a random access response to the UE and provides the UE with information about TA (timing advance). In order to transmit ACK/NACK in response to information on TA, the base station schedules PUSCH to the UE.

The above operation has no obvious problems in current LTE operation. However, in the case of NR UEs to which an LTE band is assigned through a supplemental UL, ambiguity occurs on NR UEs. In particular, it is difficult for NR UEs to determine whether to perform transmission in NR UL or LTE UL.

According to the present invention, it is possible to perform a RACH operation related to a PDCCH order in consideration of operations 7-a to 7-D described below.

7-A: the base station may also indicate the carrier when it sends a PDCCH order to the UE. When time-frequency resources in which the random access preamble is transmitted are indicated, carrier information may be indicated together. The carrier information may indicate one carrier among the two carriers. Alternatively, the carrier information may indicate both carriers so that signals may be transmitted on both carriers.

7-B: when the UE transmits the random access preamble, the UE may transmit the random access preamble on the carrier indicated by the operation of 7-a.

7-C: the base station transmits a random access response to the UE in response to the random access preamble. In this case, the base station additionally transmits carrier information to the UE to designate a carrier for performing the 7-D operation, thereby causing the UE to transmit ACK/NACK in response to the 7-C operation. The carrier information may indicate one carrier among the two carriers. Alternatively, the carrier information may indicate both carriers so that signals may be transmitted on both carriers.

7-D: the UE transmits the ACK/NACK on a carrier if it indicates the carrier on which the ACK/NACK is transmitted in response to the 7-C operation according to the 7-C operation. Otherwise, the UE transmits ACK/NACK on the carrier used in 7-B operation.

In embodiment 7, although carrier information can be indicated in 7-a operation and 7-C operation, it is able to inform the UE of carriers for transmission in 7-B operation and 7-D operation via higher layer signaling (e.g., RRC signaling). In this case, the UE can be informed of the carrier for 7-B operation and the carrier for 7-D operation, respectively. Alternatively, the UE can be informed of a single carrier only if it is assumed that transmission is performed on the same carrier. Alternatively, the UE can be instructed to perform 7-B and 7-D operations on both carriers. When 7-B or 7-D operations are performed on two carriers, the signals may be repeatedly transmitted on the two carriers for each of these operations. Alternatively, the signal may be transmitted on two carriers by dividing the signal. The information on whether the signal is repeated or divided may be informed through a control channel or a higher layer (e.g., RRC signaling).

According to embodiment 7, operations 7-a to 7-D are described with specific terms used in the UE such as PDCCH order, random access preamble, random access response, and the like. However, the same form of operation may be expressed differently in NR, and the present invention may also be applied to the operation. For example, the 7-a operation may correspond to an operation for transmitting a RACH to check synchronization when the synchronization does not match. The 7-B operation may correspond to an operation of transmitting the RACH according to operation 7-a. The 7-C operation may correspond to an operation of indicating a TA via the RACH of the 7-B operation. The 7-D operation may correspond to an operation of transmitting an ACK/NACK response in response to the 7-C operation.

Further, since there are one DL and two ULs in the supplementary UL environment, it is necessary to determine the UL on which the PUSCH and PUCCH will be transmitted. As a simple approach, PUSCH and PUCCH are transmitted on a single carrier, and the carrier may be determined according to the DL RSRP threshold. Alternatively, the base station may determine the carrier via RRC configuration or MAC CE.

In case that PRACH transmission is determined according to a downlink RSRP threshold or designated by RRC signaling, PRACH transmission may also be transmitted using a carrier on which PUCCH and PUSCH are transmitted.

<Embodiment 8>

If a carrier to be transmitted is specified via RRC signaling or MAC CE (MAC control element), a period ranging from a timing at which the RRC signaling or MAC CE is forwarded to the UE to a timing at which the RRC signaling or MAC CE is checked is ambiguous in terms of the base station. Thus, embodiment 8 proposes operations 8-A to 8-C.

If a carrier on which the PUCCH and PUSCH (or also PRACH) are to be transmitted is indicated to the UE via the RRC configuration or MAC CE during a predetermined time after the reception of the RRC configuration or MAC CE, the carrier is selected

8-A: it may use the currently used carrier and then move to the indicated carrier.

8-B: for example, if the carrier on which PUCCH and PUSCH are to be transmitted is configured independently, it may use the currently used PRACH carrier and then move to the indicated carrier.

8-C: a predetermined carrier may be used and then moved to the indicated carrier. The predetermined carrier may be promised in advance or may be indicated via RRC configuration or MAC CE.

In particular, in the case of using a single carrier, it is preferable that a physical cell ID of SUL (supplemental UL) is the same as that of DL. This is because, since two ULs are used while performing the time switch, the two ULs can be managed in a manner of being regarded as a single UL.

In this case, the SUL and the DL/UL may have different subcarrier spacings. Accordingly, the scheduled PUSCH timing and HARQ ACK/NACK timing may be changed. Basically, when two ULs are used by timing switching, the PUSCH timing and the HARQ ACK/NACK timing are scheduled based on DL/UL indication and are used in a reinterpretation manner without additional indication for SUL. This is because, if it is assumed that there is no difference in the time taken between PDCCH and PUSCH or the time taken between PDSCH and PUCCH and SUL in UL, it is preferable to use the same scheduled PUSCH timing or HARQ ACK/NACK timing. For this reason, since UL and SUL have different slot lengths, the scheduled PUSCH or HARQ ACK/NACK is transmitted in a slot of a subsequent SUL that is present as much as the indication of the scheduled PUSCH timing and the indication of the HARQ ACK/NACK timing based on the slot length of DL.

<Embodiment 9>

Ambiguity may occur on a periodic UL signal (e.g., periodic CSI) if the carrier on which PUSCH/PUCCH is to be transmitted is determined via RRC or MAC CE in SUL. When transmitting a periodic signal, if a carrier is changed between transmission periods and UL and SUL have different parameter sets, it is difficult for the UE to determine resources and formats to be used for transmission after the carrier change. Thus, embodiment 9 of the present invention can consider operations 9-a to 9-C described below.

9-A: in SUL, if the PUSCH for transmitting the periodic UL signal or the carrier for transmitting the PUCCH is changed in the middle of transmitting the periodic UL signal, periodic UL signal transmission for transmission on the previous carrier is not performed on the new carrier due to the carrier change. If the carrier returns to the carrier on which the periodic UL signal is transmitted, the periodic UL signal transmission is restarted.

9-B: in SUL, if the PUSCH for transmitting the periodic UL signal or the carrier for transmitting the PUCCH is changed in the middle of transmitting the periodic UL signal, although the carrier is changed, since most of the periodic UL signal is not channel-related transmission of the carrier (except SRS), the transmission of the periodic UL signal is maintained regardless of the change of the carrier. In this case, the base station must set the configuration (resource configuration, transmission format configuration) of the periodic UL signal for the UE for two carriers including UL and SUL. The UE performs periodic UL signaling according to the configuration according to the transmission carrier.

9-C.9-A: in SUL, if the PUSCH for transmitting the periodic UL signal or the carrier for transmitting the PUCCH is changed in the middle of transmitting the periodic UL signal, the periodic UL signal for transmitting on the previous carrier may be continuously transmitted on the previous carrier although the carrier is changed.

In addition, the SUL can share frequency bands currently used in different RATs or frequency bands. Further, the cell ID is used to perform data scrambling and generate a reference signal sequence to perform interference randomization. Therefore, preferably, the SUL uses the cell ID of the currently shared band or RAT in terms of the network.

Fig. 12 is a diagram of a base station and a UE suitable for use in one embodiment of the present invention.

If the relay station is included in the wireless communication system, communication in a backhaul link is performed between the base station and the relay station, and communication in an access link is performed between the relay station and the user equipment. Therefore, the base station and the user equipment shown in the figure can be replaced with the relay station as the case may be.

Referring to fig. 12, the wireless communication system includes a Base Station (BS) 110 and a User Equipment (UE) 120.BS 110 includes a processor 112, a memory 114, and a Radio Frequency (RF) unit 116. The processor 112 may be configured to implement the proposed functions, processes and/or methods. The memory 114 is connected to the processor 112 and then stores various information associated with the operation of the processor 112. The RF unit 116 is connected with the processor 112 and transmits and/or receives a radio signal. The user equipment 120 includes a processor 122, a memory 124, and a Radio Frequency (RF) unit 126. The processor 122 may be configured to implement the proposed functions, processes and/or methods. The memory 124 is connected with the processor 122 and then stores various information associated with the operation of the processor 122. The RF unit 126 is connected with the processor 122 and transmits and/or receives a radio signal. The base station 110 and/or the user equipment 120 may have a single antenna or multiple antennas.

The above-described embodiments correspond to combinations of elements and features of the present invention in predetermined forms. Also, the corresponding elements or features may be considered optional unless they are explicitly mentioned. Each of these elements or features may be implemented in a manner that cannot be combined with other elements or features. Further, by partially combining elements and/or features, embodiments of the present invention can be achieved. The series of operations described for each embodiment of the present invention may be modified. Some configurations or features of one embodiment may be included in another embodiment or may be replaced with corresponding configurations or features of another embodiment. Also, it is obviously understood that the embodiments are configured by combining claims which are not explicitly cited in the appended claims or by including them as new claims through modification after filing the application.

In the present disclosure, in some cases, a specific operation explained as being performed by a base station may be performed by an upper node of the base station. In particular, in a network configured by a plurality of network nodes including a base station, it is apparent that various operations performed for communication with a user equipment may be performed by the base station or other networks other than the base station. A "Base Station (BS)" may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an Access Point (AP), and the like.

Various devices may be used to implement embodiments of the present invention. For example, embodiments of the invention may be implemented using hardware, firmware, software, and/or any combination thereof. In the case of being implemented in hardware, the method according to each embodiment of the present invention may be implemented by at least one selected from the group consisting of an ASIC (application specific integrated circuit), a DSP (digital signal processor), a DSPD (digital signal processing device), a PLD (programmable logic device), an FPGA (field programmable gate array), a processor, a controller, a microcontroller, a microprocessor, and the like.

In the case of being implemented in firmware or software, the method according to each embodiment of the present invention may be implemented by a module, a procedure, and/or a function for performing the above-described functions or operations. The software codes are stored in memory units and may subsequently be driven by processors.

The memory unit is provided inside or outside the processor to exchange data with the processor using various devices known to the public.

Although the present invention has been described and illustrated with reference to the preferred embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made therein without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Industrial applicability

The method of transmitting and receiving signals based on LTE and NR in a wireless communication system and the apparatus therefor can be applied to various wireless communication systems.

Claims (12)

1. A method of a new radio access technology, NR, terminal for transmitting and receiving signals in a wireless communication system, the method comprising the steps of:

receiving a physical downlink control channel, PDCCH, order on a downlink carrier; and

transmitting a random access preamble in response to the PDCCH order;

wherein the random access preamble is transmitted on a first uplink carrier determined based on information on an uplink carrier included in the PDCCH order when a predetermined condition is satisfied,

wherein the predetermined condition comprises a plurality of uplink carriers including the first uplink carrier configured for the downlink carrier, and

wherein the cell identification ID of the downlink carrier is the same as the cell ID of the plurality of uplink carriers.

2. The method of claim 1, wherein the plurality of uplink carriers comprises a second uplink carrier, and the second uplink carrier is a supplemental uplink carrier related to a Long Term Evolution (LTE) band additionally assigned to the NR terminal.

3. The method of claim 2, wherein the random access preamble is transmitted via a same subcarrier spacing as a higher layer initiated random access preamble transmission when the first uplink carrier and the second uplink carrier are not configured.

4. The method of claim 1, further comprising: at least one of a time resource and a frequency resource is configured to perform uplink transmission.

5. The method of claim 1, further comprising: parameters for performing uplink transmission are received.

6. The method of claim 1, wherein the PDCCH order is received using downlink, DL, control information.

7. A new radio access technology, NR, terminal in a wireless communication system, the NR terminal comprising:

a Radio Frequency (RF) unit; and

a processor coupled to the RF unit, the processor configured to:

control the RF unit to receive a physical Downlink control channel, PDCCH, order on a downlink carrier,

control the RF unit to transmit a random access preamble in response to the PDCCH order;

wherein the random access preamble is transmitted on a first uplink carrier determined based on information on an uplink carrier included in the PDCCH order when a predetermined condition is satisfied,

wherein the predetermined condition comprises a plurality of uplink carriers including the first uplink carrier configured for the downlink carrier, and

wherein the cell identification ID of the downlink carrier is the same as the cell ID of the plurality of uplink carriers.

8. The NR terminal of claim 7 wherein the plurality of uplink carriers comprises a second uplink carrier and the second uplink carrier is a supplemental uplink carrier related to a long term evolution, LTE, frequency band additionally assigned to the NR terminal.

9. The NR terminal of claim 8, wherein the random access preamble is transmitted via a same subcarrier spacing as a higher layer initiated random access preamble transmission when the first uplink carrier and the second uplink carrier are not configured.

10. The NR terminal of claim 7 wherein the processor is further configured to: at least one of a time resource and a frequency resource is configured to perform uplink transmission.

11. The NR terminal of claim 7 wherein the processor is further configured to: parameters for performing uplink transmission are received.

12. The NR terminal of claim 7, wherein the PDCCH order is received using downlink DL control information.

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